﻿namespace SolveEquation
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入a的值：");
            int a = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入b的值：");
            int b = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入c的值：");
            int c = int.Parse(Console.ReadLine());

            //计算根
            double x1, x2;
            if (b * b - 4 * a * c > 0)
            {

                x1 = (-b + Math.Sqrt(b * b - 4 * a * c)) / 2 * a;
                x2 = (-b - Math.Sqrt(b * b - 4 * a * c)) / 2 * a;
                Console.WriteLine("一元二次方程{0}*x*x+{1}*x+{2}=0的根为：{3}\t{4}", a, b, c, x1, x2);
            }
            else if (b * b - 4 * a * c == 0)
            {
                x1 = (-b + Math.Sqrt(b * b - 4 * a * c)) / 2 * a;
                Console.WriteLine("一元二次方程{0}*x*x+{1}*x+{2}=0的根为：{3}", a, b, c, x1);
            }
            else
            {
                Console.WriteLine("一元二次方程{0}*x*x+{1}*x+{2}=0无解！", a, b, c);
            }

            Console.ReadLine();        

        }
    }
}